Typewriting machine



May 29, 1928.

M. W. POOL TYPEWRITING MACHINE Filed Aug. 31, 1927 E VVV E s wii? ATTORNEY raeaieama zaleza s [I UNITED STATES PA-TENT OFFICE.

. ing drawnto a larger scale than on a plane .indicated struction.

enlarged scale, in Fig. 1. 1

MORRIS w. 2001., or BROOKLYN, new

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YORK ASSIGNOR T0 REMINGTON TYPEWRI'IEB COMPANY, OF IIaION, NEW YORK, A CORPORATION OF NEW Your.

Application illed'August 31, 1927. serial No. 216,039.

My invention relates to type her contact devices or anvils, and the ObJBCl) of the invention is to provide a new andimproved anvil in which the noise due to the coaction of the type bars and the anvil will be mini,- mized. I

The gist of the invention lies. in the provision of a series of openings or slots formed in the striking surface of the anvil which is tubular in cross section, the type, bars being adapted to strike the anvil between the slots which interrupt and break up the sound waves resulting from the type bar blows.

To the above ends, the invention consists in the featuresof construction, combinations of devices and arrangements of parts hereinai'ter described and particularly pointed outin the claims. In' the accompanying drawings which illustrate three different forms of the invention,

Fig. 1 is a fragmentaryfront' elevation showing the type bar support or segment with one form, of my invention applied thereto. I

Fig. 2 is a vertical, sectional view taken centrally of the segment and showing a type bar in contact with the anvil, saidFlflg. 2 be- 1g. 1. Fig. 3 is a front elevation, drawn to an of 'the type bar anvil shown Fig. 4.is a transverse, sectional view taken by the section line H in Fig. 3 and looking in the direction of the arrow at said line.

Fig. 5 is a view correspondin to Fig. 4 but showing a modification wherein the-anvil is slotted at opposite faces.

Fig. 6 is a view corresponding to. Fig. 3 butv showing still another modification where-i in the slots are disposed in arallelism instead of radially as in the igs. 1-4 con- Fig. 7 is a sectional view taken on alpla'ne indicated by the section line'7-7 in 6 and looking in the direction of the arrow atsaid line.

Referrin first to the construction 1l1usli igs. 1 to 4. the type bar segment trated in or. support 1 is that .of a NIo; 12 typewriting machine to winch my lnventlon 1s shown as-applied. Said segment 1 is secured by screws 24 the frami set the machine, below andsomewhat orward of thelphten 4. The 1.1a formed w th and a lower case 7 controlled devices,

mon point somewhat below the printi point on the platen as is well unders and adapted to these guide slots are type bars 6 each provided at its outerend with a type block 7 having an upper case type type that selectively cooperate with the front face of the platen 4. The type bars 6 are pi voted on a common fulcrum wire 8 secured to the segment 1 and are actuated each by the usual train of'key being swung thereby upward and rearward on thefulcrum wire 8 to printing position. As they approach the platen, the types cooperate with a guide opening 9 in a center guide 10 secured by screws 11 to thefront of the segment.

.as illustrated, in the form of a metal tube which is bentto arcuate shape and is adapted to a seat provided by a-depression or groove 13 formed in the front face of the segment 1. The groove 13 is ofarcuate' shape and the tubular anvil 12 conforms-to this shape, so that it may readily be slid into and-out a series of guide slots radiating from a com- My improved anvil or contact device, designated as a whole by the numeral 12, is, J

of place in its seat or groove, it having both of its ends open for this purpose. 'The groove is open at the front, as indicated at 14,, so that when the anvil is in place its striking face is exposed for coo enation with the type bars. As will be an erstood from Fig. 2, while the opening 14 permits the anvil 12 to protrude forward so that .its

striking face is presented to the printing type bars, the width of the openingjis too narrow 'to the anvil, ndwise displacement of the anvil in its seat or groove isprevented by closupee or plates 15 which are detachablysecured to the top of .the segment by screws 16. Re- .moval of the plates'permits the anvil to be readily slipped. out and replaced'when des red.

. In carryin the striking ace of the anvil 12 with a series of openings, which as shown in the Figs. L4

construction are in the form of radial slots or kerfs 17. These correspond substantially to the number of'type- 'bars. 6 and are so strike on the solid tween the slots, .designated for descriptive portions of'the anvil behese solid qu't my invention, 1 provide portions being rmit forward displacement of I disposed that the typeibars are adapted to the anvil is so dis osed' will engage with it met p 1 finely adjusted relationship with the printing face of the platen,

' noise is minimized.

- the manner disc as illustrated'are vertical the 'anvilfithereby minimizing t eating the striking points of the type each type bar when in striking position will be in substantial arallelism with'the slots at its opposite si es. These slots will interrupt and disintegrate the sound waves resulting from the contact of the typebar with he noise without sacri cing the advantages resulting from associating the ty bar. with anranvilior contact surface 0 tempered metal. As is well understood, to obtain the best results that the type bar prior to contact with the platen, whereby the printing effect is obtained by a whipping over 0 the portion of the. type bar above its point of arrest by the anv l. Uniformity of printing requires that the contact surface shall remain in its and this, of course, can not be obtained with anvils havin soft and easily worn striking faces. A bar -surfaced anvil, on the other hand, is ordinarily noisy, but by the use of my invention the To eliminate noise as ossible, the bore of thetube 12 19 of rawhide much as may be fil ed with a core piece or other suitable materia The principle of breaking up the sound waves by transverse slots may be a plied in a number of wa s totubular anvi s besides osed in the Figs. L4 form. In Fig. 5, a modification is illustrated wherein the tube 20 is provided, 'as before, with slots 21 at its front or striking face and may also be provided witho nings or slots 22 at its rear. The rear s ots 22 may correspond'in ition and arrangement with the slots at t e front or striking face, if preferred. The Fig. 5 construction has the further advan of being readily reversible, whereby the ife ofthe anvil may be prolonged.

Another modificationis illustrated in Figs. 6 and 7. In this construction, the anvil 23 is provided with a series of parallel slots 24 in place of the radially disposed slots of the Figs. 1-4 construction. These parallel slots when the anvil is in place in the-machine. The type bars, particularly those near the ends of the set, strike crosswise of the slots but as will be plain from a consideration of Fig. 7 said bars always contact with the solid portlon of the anvil as at 25, this numbeti; indiars. My invention has proved to be e ective in practice and it has the merits of being simple and cheap to manufacture, besides beingadapted to replace other styles of anvils in existing makes of typewriting machines with- I imam out ntating material alterations in said mach res. v

What I claimas new and desire to secure by. Letters Patent, is:'- v

a The combination of a platen, a plurality of type bars, andan arcuate tube arran in the paths of the type-bars so as to. be struck at difierent bars'as they near the en of their printing strokes, the tube being formed with openings between the striking points of the type bars.

2. The combination of a platen, a pluralityx of type bars, and a metal anvil with w ich said type bars cooperate, saidanvil being circular in cross section and formed with transverse kerfs'.

3. The combination of a platen, a pluralityl of type bars, and a metal anvil with w ich said type bars cooperate, said anvil being circular in cross section and formed with transverse kerfs, the number of said kerfs corresponding substantially with the number of ty bars.

4. The com ination of aplaten, a type bar support, type'bars mounted thereon, and an anvil seated in a depression in said sup rt and provided with a series of slots exten ing crosswise of the anvil.

5. The combination of a platen, a type bar support, type bars pivoted thereon, and an arcuate tube seated in a depression in said support and provided with a series of converging slots extending radially of the tube,

the t pe bars being adapted to strike the tube tween the. slots.

6. The combination of a platen, a vertical' type bar su port, type bars pivoted -thereon and adatpe to coactwith the front face of the platen, and an arcuate metal anvil secured to said support and, provided at' its striking face with a series of converging slots extending transversely of the anvil, the type bars be adapted to coact with the anvil between t e slots.

7. The combination of a platen, a "vertical type bar su port, type bars pivoted thereon ints by said type;

and adatpe to coact with the front faoe'of the platen, and an arcuate anvil secured to said support and provide'd'at its face with a series of converging'slots extending transversely of the anvil, the type bars bein adapted to coact with the anvil between t e slots, and the opposite face of the anvil being also. rovided with a plurality of gpenings or acts.

Sign at the borough of Manhattan, city of New York in the county of New York and State of New York, this 30th day .of August, A. D. 1927.

. MORRIS "w. POOL. 

